cmm

### Creating an Auto High Point

Auto High Point button

Use the High Point auto option to search a user-defined search region to locate the highest point in the current workplane. This samples the region itself for the highest point. It does not search existing points in your measurement routine.

View High Point Creation Example:

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View High Point Execution Example:

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High Point execution details:

- PC-DMIS begins its search at the start point.

- It takes eight sampling hits around the start point at the distance specified for the Increment value.

- If a higher point is found, it becomes the new start point, and PC-DMIS again takes the eight sampling hits around the point. This continues until PC-DMIS cannot find a higher point at the Increment distance.

- PC-DMIS then continues taking sampling hits, reducing the Increment value until it matches the Tolerance value. This completes the high point search.

- Once the search finishes, PC-DMIS displays the new high point value on the CAD model itself by moving the point ID to the found high point location within the search region.

The result of the search is a single point defined by its X, Y, and Z coordinates and approach vector.

To access the High Point option, access the Auto Feature dialog box for a High Point (Insert | Feature | Auto | Point | High).

Auto Feature dialog box - High Point

With the dialog box open, use one of the following methods to create the feature.

Using Surface Data on the Screen

To define the high point search area using surface data:

1. Position the mouse pointer in the Graphic Display window to indicate the desired location of the start point (on the surface).

2. Click once to define the Center of the search region and the Start Point. PC-DMIS highlights the selected surface.

3. Click again to define the Start Point. As long as the dialog box remains open, every odd-numbered click on the part model's surface defines the Center and the Start Point to be the same as the clicked location. Every even-numbered click defines a new Start Point location only.

4. Verify that the correct surface has been selected. PC-DMIS pierces the highlighted surface, displaying the location and vector of the selected point. The direction of the surface normal vector is determined by the side of the part that is accessible to the probe. If both sides of the part are equally accessible, the normal from the CAD data is used. The Flip Vector icon () on the dialog box lets you change the direction of the approach.

5. Select the type of search zone to use by choosing either Circular or Box from the Mode list in the Measurement Properties area.

6. Define the size of the search zone by changing the values in the Width and Length boxes for a box type search zone, or the Inner Radius and Outer Radius boxes for a circular type search zone. PC-DMIS displays the search zone in the highlight color.

7. Define the Increment and Tolerance values for the high point procedure to use.

8. Make any other changes as needed in the dialog box.

9. Click Create to insert the feature into the measurement routine. When you execute the measurement routine, PC-DMIS searches for and then returns the highest point within the defined search region.

Using Surface Data with the CMM

To define the search region for the high point with the CMM:

1. Touch once on the desired surface of the part using the probe. This will define both the center of the search area and the start point as being the same.

2. If a different search center is desired, touch the desired surface with the probe once more. This defines a new center for the search region. If another point is sampled with the probe, it changes the location of the start point and approach vector. Each consecutive sample taken alternates between the search center and the start point. Each time that the probe samples the surface of the part, PC-DMIS pierces the CAD surface closest to where the probe touched. This information gathered from the surface model is used to define the start point and search center.

3. Select the type of search zone to use by choosing either Circular or Box from the Mode list in the Measurement Properties area.

4. Define the size of the search zone by changing the values in the Width and Length boxes for a box type search zone, or the Inner Radius and Outer Radius boxes for a circular type search zone. PC-DMIS displays the search zone in the highlight color.

5. Define the Increment and Tolerance values for the high point procedure to use.

6. Make any other changes as needed in the dialog box.

7. Click Create to insert the feature into the measurement routine. When you execute the measurement routine, PC-DMIS searches for and then returns the highest point within the defined search region.

You should select the Find Noms option in the Mode list for this measurement method. For more information on nominals, see the "Mode List" topic in the PC-DMIS Core documentation.

Without Using CAD Data

If the search region for the high point is to be generated without the use of CAD data, the first hit that is taken indicates the X, Y, and Z nominal for the start point and the search center. PC-DMIS also displays the I, J, K approach vector of that hit. This value indicates the opposite direction of the CMM approach vector (pointing away from the surface). To define a new starting point, sample the surface using the probe at the desired center point location. Consecutive samples alternate between the start point and the search center.

1. Select the type of search zone to use by choosing either Circular or Box from the Mode list in the Measurement Properties area.

2. Define the size of the search zone by changing the values in the Width and Length boxes for a box type search zone, or the Inner Radius and Outer Radius boxes for a circular type search zone. PC-DMIS displays the search zone in the highlight color.

3. Define the Increment and Tolerance values for the high point procedure to use.

4. Make any other changes as needed in the dialog box.

5. Click Create to insert the feature into the measurement routine. When you execute the measurement routine, PC-DMIS searches for and then returns the highest point within the defined search region.

Typing the Data

This method allows you to type the center of the high point's search region (that is, the middle of the box or center of the circle or circles) by supplying the X, Y, and Z values. It also allows for the definition of the start point and associated approach vector by typing in the X, Y, Z, I, J, and K values.

1. Type the desired X, Y, Z, I, J, and K values for the feature into the dialog box.

2. Select the type of search zone to use by choosing either Circular or Box from the Mode list in the Measurement Properties area.

3. Define the size of the search zone by changing the values in the Width and Length boxes for a box type search zone, or the Inner Radius and Outer Radius boxes for a circular type search zone. PC-DMIS displays the search zone in the highlight color.

4. Define the Increment and Tolerance values for the high point procedure to use.

5. Make any other changes as needed in the dialog box.

6. Click Create to insert the feature into the measurement routine. When you execute the measurement routine, PC-DMIS searches for and then returns the highest point within the defined search region.